The Martial Soul Hall members in Gengxin City were mostly controlled by Sun Ming, their soul power sealed, awaiting replacement by the main hall.
As for why not kill these scoundrels preying on the common folk.
Even though Bibi Dong once said that Sun Ming was an honorary elder of the Martial Soul Hall, equivalent in status to the Pope, he was ultimately not one of them. How to punish them was for the main hall to decide; he could not exceed his authority.
If the Martial Soul Hall doesn't plan to kill them, it's not an issue.
The method Sun Ming used to seal soul power is likely unbreakable; using soul power to violently break the seal would cause meridians to shatter, leaving them crippled, even less than ordinary people.
On his journey, whenever encountering bandits, Sun Ming would seal their soul power and hand them over to the local authorities for judgment.
